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Eclipse Platform
Release 3.5

Class BidiSegmentEvent

  extended by 

      extended by org.eclipse.swt.internal.SWTEventObject
          extended by
              extended by 
All Implemented Interfaces:

public class BidiSegmentEvent
extends TypedEvent

This event is sent to BidiSegmentListeners when a line is to be measured or rendered in a bidi locale. The segments field is used to specify text ranges in the line that should be treated as separate segments for bidi reordering. Each segment will be reordered and rendered separately.

The elements in the segments field specify the start offset of a segment relative to the start of the line. They must follow the following rules:

  • first element must be 0
  • elements must be in ascending order and must not have duplicates
  • elements must not exceed the line length
In addition, the last element may be set to the end of the line but this is not required. The segments field may be left null if the entire line should be reordered as is.

A BidiSegmentListener may be used when adjacent segments of right-to-left text should not be reordered relative to each other. For example, within a Java editor, you may wish multiple right-to-left string literals to be reordered differently than the bidi algorithm specifies. Example:
        stored line = "R1R2R3" + "R4R5R6"
                R1 to R6 are right-to-left characters. The quotation marks
                are part of the line text. The line is 13 characters long.
        segments = null: 
                entire line will be reordered and thus the two R2L segments 
                swapped (as per the bidi algorithm). 
                visual line (rendered on screen) = "R6R5R4" + "R3R2R1"
        segments = [0, 5, 8]    
                "R1R2R3" will be reordered, followed by [blank]+[blank] and 
                visual line = "R3R2R1" + "R6R5R4"

See Also:
Sample code and further information, Serialized Form

Field Summary
 int lineOffset
          line start offset
  String lineText
          line text
 int[] segments
          bidi segments, see above
Fields inherited from class TypedEvent
data, display, time, widget
Fields inherited from class java.util. EventObject
Method Summary
Methods inherited from class TypedEvent
Methods inherited from class java.util. EventObject
Methods inherited from class java.lang. Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail


public int lineOffset
line start offset


String lineText
line text


public int[] segments
bidi segments, see above

Eclipse Platform
Release 3.5

Guidelines for using Eclipse APIs.

Copyright (c) Eclipse contributors and others 2000, 2008. All rights reserved.

  Published under the terms of the Eclipse Public License Version 1.0 ("EPL") Design by Interspire